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deviceiocontrol (kernel32)
 
.
Summary

C# Signature:

[DllImport("kernel32.dll", ExactSpelling = true, SetLastError = true, CharSet = CharSet.Auto)]
static extern bool DeviceIoControl(IntPtr hDevice, uint dwIoControlCode,
IntPtr lpInBuffer, uint nInBufferSize,
IntPtr lpOutBuffer, uint nOutBufferSize,
out uint lpBytesReturned, IntPtr lpOverlapped);

C# Signature:

[DllImport("Kernel32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public static extern bool DeviceIoControl(
        IntPtr hDevice,
        uint dwIoControlCode,
        ref long InBuffer,
        int nInBufferSize,
        ref long OutBuffer,
        int nOutBufferSize,
        ref int pBytesReturned,
        [In] ref NativeOverlapped lpOverlapped);

C# Signature:

    [DllImport("Kernel32.dll", SetLastError = false, CharSet = CharSet.Auto)]
    public static extern bool DeviceIoControl(
        Microsoft.Win32.SafeHandles.SafeFileHandle hDevice,
        EIOControlCode IoControlCode,
        [MarshalAs(UnmanagedType.AsAny)]
        [In] object InBuffer,
        uint nInBufferSize,
        [MarshalAs(UnmanagedType.AsAny)]
        [Out] object OutBuffer,
        uint nOutBufferSize,
        ref uint pBytesReturned,
        [In] ref System.Threading.NativeOverlapped Overlapped
    );

VB Signature:

    <DllImport("kernel32.dll", ExactSpelling := True, SetLastError := True, CharSet := CharSet.Auto)>
    Shared Function DeviceIoControl(ByVal hDevice As IntPtr, ByVal dwIoControlCode As UInteger, ByVal lpInBuffer As IntPtr, ByVal nInBufferSize As UInteger, ByVal lpOutBuffer As IntPtr, ByVal nOutBufferSize As UInteger, ByRef lpBytesReturned As UInteger, ByVal lpOverlapped As IntPtr) As Boolean
    End Function

VB Signature:

    <DllImport("Kernel32.dll", CharSet:=CharSet.Auto, SetLastError:=True)>
    Public Shared Function DeviceIoControl(ByVal hDevice As IntPtr, _
    ByVal dwIoControlCode As UInteger, ByRef InBuffer As Long, _
    ByVal nInBufferSize As Integer, ByRef OutBuffer As Long, _
    ByVal nOutBufferSize As Integer, ByRef pBytesReturned As Integer, _
    <[In]()> ByRef lpOverlapped As NativeOverlapped) As Boolean
    End Function

VB Signature:

    <DllImport("Kernel32.dll", SetLastError := False, CharSet := CharSet.Auto)>
    Public Shared Function DeviceIoControl( _
    ByVal hDevice As Microsoft.Win32.SafeHandles.SafeFileHandle, _
    ByVal IoControlCode As EIOControlCode, _
    <MarshalAs(UnmanagedType.AsAny), [In]()> ByVal InBuffer As Object, _
    ByVal nInBufferSize As UInteger, <MarshalAs(UnmanagedType.AsAny), _
    Out()> ByVal OutBuffer As Object, ByVal nOutBufferSize As UInteger, _
    ByRef pBytesReturned As UInteger, <[In]()> _
    ByRef Overlapped As System.Threading.NativeOverlapped) As Boolean
    End Function

User-Defined Types:

None.

Notes:

hDevice - To retrieve a handle to a volume, call CreateFile with the lpFileName parameter set to a string of the following form: \\.\DriveLetter:. DriveLetter is not case-sensitive and does not require a colon after it.

Example:

tHandle = CreateFile(@"\\.\C:", FileAccess.Read, FileShare.ReadWrite, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero)

lpOverlapped - Main use in asynchronous deviceIoControl. NativeOverlapped is the managed version of the structure and use is the same. The difference between NativeOverlapped and Overlapped is managed Struct vs managed Class respectively. NativeOverlapped was more condusive for one-way device driver communication. Convert from Overlapped to NativeOverlapped to make the call, since NativeOverlapped is explicitly defined to mimic the unmanaged Overlapped structure.

Tips & Tricks:

This is great for interacting with devices; now perhaps someone can help with the SetupDi calls to actually discover the device handles, etc...? If you are able to conquer it (I wasn't) toss me a mail at dotnet at richardgoodwin dot com

-

Pin your NativeOverlapped structure, DeviceIoControl is asynchronous and will write into the overlapped structure upon completion of IO requested. If you NativeOverlapped structure has been moved by garbage collection it will write into the wrong area causing heap corruption.

-

If you want x64 proccessor support, you CANNOT use the System.Threading.NativeOverlapped structure as a ref parameter described above. The overlap structure must be allocated in global memory space. See the section "DeviceIoControl w/x64 support":

Regards,

Travis

-

Sample Code:

Public ReadOnly Property CardID() As String
  Get
   Dim dwErrorCode As FarcConstants
   Dim dwBytesReceived As Int32
   Dim ip As IntPtr = Marshal.AllocHGlobal(13)
   Dim erg As String
   If DeviceIoControl(hDriver, IOCTL_FARC_GET_CARDID, Nothing, 0, ip, 13, dwBytesReceived, Nothing) Then
     erg = Marshal.PtrToStringAnsi(ip)
     Marshal.FreeHGlobal(ip)
   Else
     dwErrorCode = Marshal.GetLastWin32Error
     Marshal.FreeHGlobal(ip)
     Throw New InvalidOperationException("Get Card ID fails. Errorcode: " & _
       dwErrorCode.ToString, New System.ComponentModel.Win32Exception(dwErrorCode))
   End If
   Return erg
  End Get
End Property

Sample Code:

public bool DeviceIoControl( IntPtr hDevice, uint dwIoControlCode, ref long buffer, int bufferSize, ref NativeOverlapped pOverlapped)
{
    int NoReturn = 0;
    return DeviceIoControl( hDevice, dwIoControlCode, ref buffer, bufferSize, ref buffer, bufferSize, ref NoReturn, ref pOverlapped );
}

public bool PlxIntrAttach(IntPtr handle, PlxIntr intrType)
{
    // Call to PLX card to attach wait event to an Interrupts
    // Declare control code
    uint Control;
    DriverMsgs AttachMsg = DriverMsgs.MsgIntrAttach;
    Control = CtrCode( cFileDeviceUnknown, (int)AttachMsg, cMethodBuffered, cFileAnyAccess );
    // Set return variable up
    bool Status = false;
    // Initialize the "buffer"
    long DeviceBuffer = 0;

    // Fill the buffer with the interrupt bitflag
    DeviceBuffer = (long)intrType;
    // Call the P/Invoked function through masking method
    Status = DeviceIoControl( handle, Control, ref DeviceBuffer, 8, ref AdcOverlapData );
    // Return with Status
    return Status;
}

Sample Code:

public byte[] ReadRawPartition(int harddisk, int partition, int sectors)
{
   var name = string.Format(
     @"\\?\GLOBALROOT\Device\Harddisk{0}\Partition{1}",
     harddisk, partition);
   var handle = Win32.CreateFile(name, FileAccess.Read, FileShare.ReadWrite,
     IntPtr.Zero, FileMode.Open, FileAttributes.Normal, IntPtr.Zero);
   int dummy;
   var diskGeo = new DISK_GEOMETRY();
   Win32.DeviceIoControl(handle, IOCTL.DISK_GET_DRIVE_GEOMETRY,
     IntPtr.Zero, 0, out diskGeo, Marshal.SizeOf(diskGeo), out dummy, IntPtr.Zero);
   var partInfo = new PARTITION_INFORMATION();
   Win32.DeviceIoControl(handle, IOCTL.DISK_GET_PARTITION_INFO,
     IntPtr.Zero, 0, out partInfo, Marshal.SizeOf(partInfo), out dummy, IntPtr.Zero);

   var length = sectors * diskGeo.BytesPerSector;
   var data = new byte[length];
   int len;
   if (!Win32.ReadFile(handle, data, length, out len, IntPtr.Zero))
     return null;
   if (length != len) Array.Resize(ref data, len);
   return data;
}

cf. DISK_GEOMETRY, PARTITION_INFORMATION

Alternative Managed API:

Do you know one? Please contribute it!

Alternative Managed API with necessary Flags defined:

using System;
using System.Threading;
using System.IO;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;

[Flags]
public enum EMethod : uint
{
    Buffered    = 0,
    InDirect    = 1,
    OutDirect    = 2,
    Neither        = 3
}    

[Flags]
public enum EFileDevice : uint
{
    Beep                = 0x00000001,
    CDRom                = 0x00000002,
    CDRomFileSytem        = 0x00000003,
    Controller            = 0x00000004,
    Datalink            = 0x00000005,
    Dfs                    = 0x00000006,
    Disk                = 0x00000007,
    DiskFileSystem        = 0x00000008,
    FileSystem            = 0x00000009,
    InPortPort            = 0x0000000a,
    Keyboard            = 0x0000000b,
    Mailslot            = 0x0000000c,
    MidiIn                = 0x0000000d,
    MidiOut                = 0x0000000e,
    Mouse                = 0x0000000f,
    MultiUncProvider    = 0x00000010,
    NamedPipe            = 0x00000011,
    Network                = 0x00000012,
    NetworkBrowser        = 0x00000013,
    NetworkFileSystem    = 0x00000014,
    Null                = 0x00000015,
    ParallelPort        = 0x00000016,
    PhysicalNetcard        = 0x00000017,
    Printer                = 0x00000018,
    Scanner                = 0x00000019,
    SerialMousePort        = 0x0000001a,
    SerialPort            = 0x0000001b,
    Screen                = 0x0000001c,
    Sound                = 0x0000001d,
    Streams                = 0x0000001e,
    Tape                = 0x0000001f,
    TapeFileSystem        = 0x00000020,
    Transport            = 0x00000021,
    Unknown                = 0x00000022,
    Video                = 0x00000023,
    VirtualDisk            = 0x00000024,
    WaveIn                = 0x00000025,
    WaveOut                = 0x00000026,
    Port8042            = 0x00000027,
    NetworkRedirector    = 0x00000028,
    Battery                = 0x00000029,
    BusExtender            = 0x0000002a,
    Modem                = 0x0000002b,
    Vdm                    = 0x0000002c,
    MassStorage            = 0x0000002d,
    Smb                    = 0x0000002e,
    Ks                    = 0x0000002f,
    Changer                = 0x00000030,
    Smartcard            = 0x00000031,
    Acpi                = 0x00000032,
    Dvd                    = 0x00000033,
    FullscreenVideo        = 0x00000034,
    DfsFileSystem        = 0x00000035,
    DfsVolume            = 0x00000036,
    Serenum                = 0x00000037,
    Termsrv                = 0x00000038,
    Ksec                = 0x00000039,
    // From Windows Driver Kit 7
    Fips                = 0x0000003A,
    Infiniband            = 0x0000003B,
    Vmbus                = 0x0000003E,
    CryptProvider            = 0x0000003F,
    Wpd                = 0x00000040,
    Bluetooth            = 0x00000041,
    MtComposite            = 0x00000042,
    MtTransport            = 0x00000043,
    Biometric            = 0x00000044,
    Pmi                = 0x00000045
}

/// <summary>
/// IO Control Codes
/// Useful links:
///     http://www.ioctls.net/
///     http://msdn.microsoft.com/en-us/library/windows/hardware/ff543023(v=vs.85).aspx
/// </summary>
[Flags]
public enum EIOControlCode : uint
{
     // STORAGE
     StorageCheckVerify = (EFileDevice.MassStorage << 16) | (0x0200 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageCheckVerify2 = (EFileDevice.MassStorage << 16) | (0x0200 << 2) | EMethod.Buffered | (0 << 14), // FileAccess.Any
     StorageMediaRemoval = (EFileDevice.MassStorage << 16) | (0x0201 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageEjectMedia = (EFileDevice.MassStorage << 16) | (0x0202 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageLoadMedia = (EFileDevice.MassStorage << 16) | (0x0203 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageLoadMedia2 = (EFileDevice.MassStorage << 16) | (0x0203 << 2) | EMethod.Buffered | (0 << 14),
     StorageReserve = (EFileDevice.MassStorage << 16) | (0x0204 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageRelease = (EFileDevice.MassStorage << 16) | (0x0205 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageFindNewDevices = (EFileDevice.MassStorage << 16) | (0x0206 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageEjectionControl = (EFileDevice.MassStorage << 16) | (0x0250 << 2) | EMethod.Buffered | (0 << 14),
     StorageMcnControl = (EFileDevice.MassStorage << 16) | (0x0251 << 2) | EMethod.Buffered | (0 << 14),
     StorageGetMediaTypes = (EFileDevice.MassStorage << 16) | (0x0300 << 2) | EMethod.Buffered | (0 << 14),
     StorageGetMediaTypesEx = (EFileDevice.MassStorage << 16) | (0x0301 << 2) | EMethod.Buffered | (0 << 14),
     StorageResetBus = (EFileDevice.MassStorage << 16) | (0x0400 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageResetDevice = (EFileDevice.MassStorage << 16) | (0x0401 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     StorageGetDeviceNumber = (EFileDevice.MassStorage << 16) | (0x0420 << 2) | EMethod.Buffered | (0 << 14),
     StoragePredictFailure = (EFileDevice.MassStorage << 16) | (0x0440 << 2) | EMethod.Buffered | (0 << 14),
     StorageObsoleteResetBus = (EFileDevice.MassStorage << 16) | (0x0400 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     StorageObsoleteResetDevice = (EFileDevice.MassStorage << 16) | (0x0401 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     // DISK
     DiskGetDriveGeometry = (EFileDevice.Disk << 16) | (0x0000 << 2) | EMethod.Buffered | (0 << 14),
     DiskGetDriveGeometryEx = (EFileDevice.Disk << 16) | (0x0028 << 2) | EMethod.Buffered | (0 << 14),
     DiskGetPartitionInfo = (EFileDevice.Disk << 16) | (0x0001 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskGetPartitionInfoEx = (EFileDevice.Disk << 16) | (0x0012 << 2) | EMethod.Buffered | (0 << 14),
     DiskSetPartitionInfo = (EFileDevice.Disk << 16) | (0x0002 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskGetDriveLayout = (EFileDevice.Disk << 16) | (0x0003 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskSetDriveLayout = (EFileDevice.Disk << 16) | (0x0004 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskVerify = (EFileDevice.Disk << 16) | (0x0005 << 2) | EMethod.Buffered | (0 << 14),
     DiskFormatTracks = (EFileDevice.Disk << 16) | (0x0006 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskReassignBlocks = (EFileDevice.Disk << 16) | (0x0007 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskPerformance = (EFileDevice.Disk << 16) | (0x0008 << 2) | EMethod.Buffered | (0 << 14),
     DiskIsWritable = (EFileDevice.Disk << 16) | (0x0009 << 2) | EMethod.Buffered | (0 << 14),
     DiskLogging = (EFileDevice.Disk << 16) | (0x000a << 2) | EMethod.Buffered | (0 << 14),
     DiskFormatTracksEx = (EFileDevice.Disk << 16) | (0x000b << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskHistogramStructure = (EFileDevice.Disk << 16) | (0x000c << 2) | EMethod.Buffered | (0 << 14),
     DiskHistogramData = (EFileDevice.Disk << 16) | (0x000d << 2) | EMethod.Buffered | (0 << 14),
     DiskHistogramReset = (EFileDevice.Disk << 16) | (0x000e << 2) | EMethod.Buffered | (0 << 14),
     DiskRequestStructure = (EFileDevice.Disk << 16) | (0x000f << 2) | EMethod.Buffered | (0 << 14),
     DiskRequestData = (EFileDevice.Disk << 16) | (0x0010 << 2) | EMethod.Buffered | (0 << 14),
     DiskControllerNumber = (EFileDevice.Disk << 16) | (0x0011 << 2) | EMethod.Buffered | (0 << 14),
     DiskSmartGetVersion = (EFileDevice.Disk << 16) | (0x0020 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskSmartSendDriveCommand = (EFileDevice.Disk << 16) | (0x0021 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskSmartRcvDriveData = (EFileDevice.Disk << 16) | (0x0022 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskUpdateDriveSize = (EFileDevice.Disk << 16) | (0x0032 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskGrowPartition = (EFileDevice.Disk << 16) | (0x0034 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskGetCacheInformation = (EFileDevice.Disk << 16) | (0x0035 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskSetCacheInformation = (EFileDevice.Disk << 16) | (0x0036 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskDeleteDriveLayout = (EFileDevice.Disk << 16) | (0x0040 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskFormatDrive = (EFileDevice.Disk << 16) | (0x00f3 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskSenseDevice = (EFileDevice.Disk << 16) | (0x00f8 << 2) | EMethod.Buffered | (0 << 14),
     DiskCheckVerify = (EFileDevice.Disk << 16) | (0x0200 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskMediaRemoval = (EFileDevice.Disk << 16) | (0x0201 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskEjectMedia = (EFileDevice.Disk << 16) | (0x0202 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskLoadMedia = (EFileDevice.Disk << 16) | (0x0203 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskReserve = (EFileDevice.Disk << 16) | (0x0204 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskRelease = (EFileDevice.Disk << 16) | (0x0205 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskFindNewDevices = (EFileDevice.Disk << 16) | (0x0206 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     DiskGetMediaTypes = (EFileDevice.Disk << 16) | (0x0300 << 2) | EMethod.Buffered | (0 << 14),
     DiskSetPartitionInfoEx = (EFileDevice.Disk << 16) | (0x0013 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskGetDriveLayoutEx = (EFileDevice.Disk << 16) | (0x0014 << 2) | EMethod.Buffered | (0 << 14),
     DiskSetDriveLayoutEx = (EFileDevice.Disk << 16) | (0x0015 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskCreateDisk = (EFileDevice.Disk << 16) | (0x0016 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     DiskGetLengthInfo = (EFileDevice.Disk << 16) | (0x0017 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     // CHANGER
     ChangerGetParameters = (EFileDevice.Changer << 16) | (0x0000 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     ChangerGetStatus = (EFileDevice.Changer << 16) | (0x0001 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     ChangerGetProductData = (EFileDevice.Changer << 16) | (0x0002 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     ChangerSetAccess = (EFileDevice.Changer << 16) | (0x0004 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     ChangerGetElementStatus = (EFileDevice.Changer << 16) | (0x0005 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     ChangerInitializeElementStatus = (EFileDevice.Changer << 16) | (0x0006 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     ChangerSetPosition = (EFileDevice.Changer << 16) | (0x0007 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     ChangerExchangeMedium = (EFileDevice.Changer << 16) | (0x0008 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     ChangerMoveMedium = (EFileDevice.Changer << 16) | (0x0009 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     ChangerReinitializeTarget = (EFileDevice.Changer << 16) | (0x000A << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     ChangerQueryVolumeTags = (EFileDevice.Changer << 16) | (0x000B << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     // FILESYSTEM
     FsctlRequestOplockLevel1 = (EFileDevice.FileSystem << 16) | (0 << 2) | EMethod.Buffered | (0 << 14),
     FsctlRequestOplockLevel2 = (EFileDevice.FileSystem << 16) | (1 << 2) | EMethod.Buffered | (0 << 14),
     FsctlRequestBatchOplock = (EFileDevice.FileSystem << 16) | (2 << 2) | EMethod.Buffered | (0 << 14),
     FsctlOplockBreakAcknowledge = (EFileDevice.FileSystem << 16) | (3 << 2) | EMethod.Buffered | (0 << 14),
     FsctlOpBatchAckClosePending = (EFileDevice.FileSystem << 16) | (4 << 2) | EMethod.Buffered | (0 << 14),
     FsctlOplockBreakNotify = (EFileDevice.FileSystem << 16) | (5 << 2) | EMethod.Buffered | (0 << 14),
     FsctlLockVolume = (EFileDevice.FileSystem << 16) | (6 << 2) | EMethod.Buffered | (0 << 14),
     FsctlUnlockVolume = (EFileDevice.FileSystem << 16) | (7 << 2) | EMethod.Buffered | (0 << 14),
     FsctlDismountVolume = (EFileDevice.FileSystem << 16) | (8 << 2) | EMethod.Buffered | (0 << 14),
     FsctlIsVolumeMounted = (EFileDevice.FileSystem << 16) | (10 << 2) | EMethod.Buffered | (0 << 14),
     FsctlIsPathnameValid = (EFileDevice.FileSystem << 16) | (11 << 2) | EMethod.Buffered | (0 << 14),
     FsctlMarkVolumeDirty = (EFileDevice.FileSystem << 16) | (12 << 2) | EMethod.Buffered | (0 << 14),
     FsctlQueryRetrievalPointers = (EFileDevice.FileSystem << 16) | (14 << 2) | EMethod.Neither | (0 << 14),
     FsctlGetCompression = (EFileDevice.FileSystem << 16) | (15 << 2) | EMethod.Buffered | (0 << 14),
     FsctlSetCompression = (EFileDevice.FileSystem << 16) | (16 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     FsctlMarkAsSystemHive = (EFileDevice.FileSystem << 16) | (19 << 2) | EMethod.Neither | (0 << 14),
     FsctlOplockBreakAckNo2 = (EFileDevice.FileSystem << 16) | (20 << 2) | EMethod.Buffered | (0 << 14),
     FsctlInvalidateVolumes = (EFileDevice.FileSystem << 16) | (21 << 2) | EMethod.Buffered | (0 << 14),
     FsctlQueryFatBpb = (EFileDevice.FileSystem << 16) | (22 << 2) | EMethod.Buffered | (0 << 14),
     FsctlRequestFilterOplock = (EFileDevice.FileSystem << 16) | (23 << 2) | EMethod.Buffered | (0 << 14),
     FsctlFileSystemGetStatistics = (EFileDevice.FileSystem << 16) | (24 << 2) | EMethod.Buffered | (0 << 14),
     FsctlGetNtfsVolumeData = (EFileDevice.FileSystem << 16) | (25 << 2) | EMethod.Buffered | (0 << 14),
     FsctlGetNtfsFileRecord = (EFileDevice.FileSystem << 16) | (26 << 2) | EMethod.Buffered | (0 << 14),
     FsctlGetVolumeBitmap = (EFileDevice.FileSystem << 16) | (27 << 2) | EMethod.Neither | (0 << 14),
     FsctlGetRetrievalPointers = (EFileDevice.FileSystem << 16) | (28 << 2) | EMethod.Neither | (0 << 14),
     FsctlMoveFile = (EFileDevice.FileSystem << 16) | (29 << 2) | EMethod.Buffered | (0 << 14),
     FsctlIsVolumeDirty = (EFileDevice.FileSystem << 16) | (30 << 2) | EMethod.Buffered | (0 << 14),
     FsctlGetHfsInformation = (EFileDevice.FileSystem << 16) | (31 << 2) | EMethod.Buffered | (0 << 14),
     FsctlAllowExtendedDasdIo = (EFileDevice.FileSystem << 16) | (32 << 2) | EMethod.Neither | (0 << 14),
     FsctlReadPropertyData = (EFileDevice.FileSystem << 16) | (33 << 2) | EMethod.Neither | (0 << 14),
     FsctlWritePropertyData = (EFileDevice.FileSystem << 16) | (34 << 2) | EMethod.Neither | (0 << 14),
     FsctlFindFilesBySid = (EFileDevice.FileSystem << 16) | (35 << 2) | EMethod.Neither | (0 << 14),
     FsctlDumpPropertyData = (EFileDevice.FileSystem << 16) | (37 << 2) | EMethod.Neither | (0 << 14),
     FsctlSetObjectId = (EFileDevice.FileSystem << 16) | (38 << 2) | EMethod.Buffered | (0 << 14),
     FsctlGetObjectId = (EFileDevice.FileSystem << 16) | (39 << 2) | EMethod.Buffered | (0 << 14),
     FsctlDeleteObjectId = (EFileDevice.FileSystem << 16) | (40 << 2) | EMethod.Buffered | (0 << 14),
     FsctlSetReparsePoint = (EFileDevice.FileSystem << 16) | (41 << 2) | EMethod.Buffered | (0 << 14),
     FsctlGetReparsePoint = (EFileDevice.FileSystem << 16) | (42 << 2) | EMethod.Buffered | (0 << 14),
     FsctlDeleteReparsePoint = (EFileDevice.FileSystem << 16) | (43 << 2) | EMethod.Buffered | (0 << 14),
     FsctlEnumUsnData = (EFileDevice.FileSystem << 16) | (44 << 2) | EMethod.Neither | (0 << 14),
     FsctlSecurityIdCheck = (EFileDevice.FileSystem << 16) | (45 << 2) | EMethod.Neither | (FileAccess.Read << 14),
     FsctlReadUsnJournal = (EFileDevice.FileSystem << 16) | (46 << 2) | EMethod.Neither | (0 << 14),
     FsctlSetObjectIdExtended = (EFileDevice.FileSystem << 16) | (47 << 2) | EMethod.Buffered | (0 << 14),
     FsctlCreateOrGetObjectId = (EFileDevice.FileSystem << 16) | (48 << 2) | EMethod.Buffered | (0 << 14),
     FsctlSetSparse = (EFileDevice.FileSystem << 16) | (49 << 2) | EMethod.Buffered | (0 << 14),
     FsctlSetZeroData = (EFileDevice.FileSystem << 16) | (50 << 2) | EMethod.Buffered | (FileAccess.Write << 14),
     FsctlQueryAllocatedRanges = (EFileDevice.FileSystem << 16) | (51 << 2) | EMethod.Neither | (FileAccess.Read << 14),
     FsctlEnableUpgrade = (EFileDevice.FileSystem << 16) | (52 << 2) | EMethod.Buffered | (FileAccess.Write << 14),
     FsctlSetEncryption = (EFileDevice.FileSystem << 16) | (53 << 2) | EMethod.Neither | (0 << 14),
     FsctlEncryptionFsctlIo = (EFileDevice.FileSystem << 16) | (54 << 2) | EMethod.Neither | (0 << 14),
     FsctlWriteRawEncrypted = (EFileDevice.FileSystem << 16) | (55 << 2) | EMethod.Neither | (0 << 14),
     FsctlReadRawEncrypted = (EFileDevice.FileSystem << 16) | (56 << 2) | EMethod.Neither | (0 << 14),
     FsctlCreateUsnJournal = (EFileDevice.FileSystem << 16) | (57 << 2) | EMethod.Neither | (0 << 14),
     FsctlReadFileUsnData = (EFileDevice.FileSystem << 16) | (58 << 2) | EMethod.Neither | (0 << 14),
     FsctlWriteUsnCloseRecord = (EFileDevice.FileSystem << 16) | (59 << 2) | EMethod.Neither | (0 << 14),
     FsctlExtendVolume = (EFileDevice.FileSystem << 16) | (60 << 2) | EMethod.Buffered | (0 << 14),
     FsctlQueryUsnJournal = (EFileDevice.FileSystem << 16) | (61 << 2) | EMethod.Buffered | (0 << 14),
     FsctlDeleteUsnJournal = (EFileDevice.FileSystem << 16) | (62 << 2) | EMethod.Buffered | (0 << 14),
     FsctlMarkHandle = (EFileDevice.FileSystem << 16) | (63 << 2) | EMethod.Buffered | (0 << 14),
     FsctlSisCopyFile = (EFileDevice.FileSystem << 16) | (64 << 2) | EMethod.Buffered | (0 << 14),
     FsctlSisLinkFiles = (EFileDevice.FileSystem << 16) | (65 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     FsctlHsmMsg = (EFileDevice.FileSystem << 16) | (66 << 2) | EMethod.Buffered | (FileAccess.ReadWrite << 14),
     FsctlNssControl = (EFileDevice.FileSystem << 16) | (67 << 2) | EMethod.Buffered | (FileAccess.Write << 14),
     FsctlHsmData = (EFileDevice.FileSystem << 16) | (68 << 2) | EMethod.Neither | (FileAccess.ReadWrite << 14),
     FsctlRecallFile = (EFileDevice.FileSystem << 16) | (69 << 2) | EMethod.Neither | (0 << 14),
     FsctlNssRcontrol = (EFileDevice.FileSystem << 16) | (70 << 2) | EMethod.Buffered | (FileAccess.Read << 14),
     // VIDEO
     VideoQuerySupportedBrightness = (EFileDevice.Video << 16) | (0x0125 << 2) | EMethod.Buffered | (0 << 14),
     VideoQueryDisplayBrightness = (EFileDevice.Video << 16) | (0x0126 << 2) | EMethod.Buffered | (0 << 14),
     VideoSetDisplayBrightness = (EFileDevice.Video << 16) | (0x0127 << 2) | EMethod.Buffered | (0 << 14)
}

[DllImport("Kernel32.dll", SetLastError = false, CharSet = CharSet.Auto)]
public static extern bool DeviceIoControl(
    SafeFileHandle hDevice,
    EIOControlCode IoControlCode,
    [MarshalAs(UnmanagedType.AsAny)]
    [In] object InBuffer,
    uint nInBufferSize,
    [MarshalAs(UnmanagedType.AsAny)]
    [Out] object OutBuffer,
    uint nOutBufferSize,
    ref uint pBytesReturned,
    [In] IntPtr Overlapped
);

-

DeviceIoControl w/x64 support

    internal class DeviceIoOverlapped
    {
    private IntPtr mPtrOverlapped = IntPtr.Zero;

    private int mFieldOffset_InternalLow = 0;
    private int mFieldOffset_InternalHigh = 0;
    private int mFieldOffset_OffsetLow = 0;
    private int mFieldOffset_OffsetHigh = 0;
    private int mFieldOffset_EventHandle = 0;

    public DeviceIoOverlapped()
    {
        // Globally allocate the memory for the overlapped structure
        mPtrOverlapped = Marshal.AllocHGlobal(Marshal.SizeOf(typeof (NativeOverlapped)));

        // Find the structural starting positions in the NativeOverlapped structure.
        mFieldOffset_InternalLow = Marshal.OffsetOf(typeof (NativeOverlapped), "InternalLow").ToInt32();
        mFieldOffset_InternalHigh = Marshal.OffsetOf(typeof (NativeOverlapped), "InternalHigh").ToInt32();
        mFieldOffset_OffsetLow = Marshal.OffsetOf(typeof (NativeOverlapped), "OffsetLow").ToInt32();
        mFieldOffset_OffsetHigh = Marshal.OffsetOf(typeof (NativeOverlapped), "OffsetHigh").ToInt32();
        mFieldOffset_EventHandle = Marshal.OffsetOf(typeof (NativeOverlapped), "EventHandle").ToInt32();
    }

    public IntPtr InternalLow
    {
        get { return Marshal.ReadIntPtr(mPtrOverlapped, mFieldOffset_InternalLow); }
        set { Marshal.WriteIntPtr(mPtrOverlapped, mFieldOffset_InternalLow, value); }
    }

    public IntPtr InternalHigh
    {
        get { return Marshal.ReadIntPtr(mPtrOverlapped, mFieldOffset_InternalHigh); }
        set { Marshal.WriteIntPtr(mPtrOverlapped, mFieldOffset_InternalHigh, value); }
    }

    public int OffsetLow
    {
        get { return Marshal.ReadInt32(mPtrOverlapped, mFieldOffset_OffsetLow); }
        set { Marshal.WriteInt32(mPtrOverlapped, mFieldOffset_OffsetLow, value); }
    }

    public int OffsetHigh
    {
        get { return Marshal.ReadInt32(mPtrOverlapped, mFieldOffset_OffsetHigh); }
        set { Marshal.WriteInt32(mPtrOverlapped, mFieldOffset_OffsetHigh, value); }
    }

    /// <summary>
    /// The overlapped event wait handle.
    /// </summary>
    public IntPtr EventHandle
    {
        get { return Marshal.ReadIntPtr(mPtrOverlapped, mFieldOffset_EventHandle); }
        set { Marshal.WriteIntPtr(mPtrOverlapped, mFieldOffset_EventHandle, value); }
    }

    /// <summary>
    /// Pass this into the DeviceIoControl and GetOverlappedResult APIs
    /// </summary>
    public IntPtr GlobalOverlapped
    {
        get { return mPtrOverlapped; }
    }

    /// <summary>
    /// Set the overlapped wait handle and clear out the rest of the structure.
    /// </summary>
    /// <param name="hEventOverlapped"></param>
    public void ClearAndSetEvent(IntPtr hEventOverlapped)
    {
        EventHandle = hEventOverlapped;
        InternalLow = IntPtr.Zero;
        InternalHigh = IntPtr.Zero;
        OffsetLow = 0;
        OffsetHigh = 0;
    }

    // Clean up the globally allocated memory.
    ~DeviceIoOverlapped()
    {
        if (mPtrOverlapped != IntPtr.Zero)
        {
        Marshal.FreeHGlobal(mPtrOverlapped);
        mPtrOverlapped = IntPtr.Zero;
        }
    }
    }

Use the above class something like this:

  DeviceIoOverlapped deviceIoOverlapped = new DeviceIoOverlapped();
  ManualResetEvent hEvent = new ManualResetEvent(false);
  deviceIoOverlapped.ClearAndSetEvent(hEvent.SafeWaitHandle.DangerousGetHandle());
  int ret;

  DeviceIoControl(hDevice, iCtlCode, inBuffer, inSize, outBuffer, outSize, out ret, deviceIoOverlapped.GlobalOverlapped)

The DeviceIoControl API must declare an IntPtr for the OVERLAPPED parameter. All other deviations are OK.

Note
.NET Framework 2.0 is needed for this.
Documentation

http://msdn.microsoft.com/en-us/library/aa363147(v=VS.85).aspx

VB .NET 3.0 Full Example (Thanks to "bogdandaniel") Edited by pPumkiN

   Imports System.Runtime.InteropServices
   Imports System.Text  

   Private Const DFP_GET_VERSION As Integer = &H74080
   Private Const DFP_SEND_DRIVE_COMMAND As Integer = &H7C084
   Private Const DFP_RECEIVE_DRIVE_DATA As Integer = &H7C088
   Private Const GENERIC_READ As Integer = &H80000000
   Private Const GENERIC_WRITE As Integer = &H40000000
   Private Const IDE_ATAPI_ID As Integer = &HA1           ' Returns ID sector for ATAPI.
   Private Const IDE_ID_FUNCTION As Integer = &HEC       ' Returns ID sector for ATA.
   Private Const IDE_EXECUTE_SMART_FUNCTION As Integer = &HB0 ' Performs SMART cmd.
   Public Const MAX_IDE_DRIVES As Integer = 4    ' // Max number of drives assuming primary/secondary, topology
   Public Const READ_ATTRIBUTE_BUFFER_SIZE As Integer = 512
   Public Const IDENTIFY_BUFFER_SIZE As Integer = 512
   Public Const READ_THRESHOLD_BUFFER_SIZE As Integer = 512
   Public Const OUTPUT_DATA_SIZE As Integer = IDENTIFY_BUFFER_SIZE + 16
   Private Const FILE_SHARE_READ As Short = &H1S
   Private Const FILE_SHARE_WRITE As Short = &H2S
   Private Const OPEN_EXISTING As Short = 3
   Private Const FILE_ATTRIBUTE_SYSTEM As Short = &H4S
   Private Const CREATE_NEW As Short = 1
   Private Const IOCTL_STORAGE_CHECK_VERIFY2 As Integer = &H2D0800
   Private Const FILE_READ_ATTRIBUTES As Integer = &H80
   Private Const IOCTL_DISK_GET_DRIVE_GEOMETRY As Integer = &H70000

   Public di As DRIVE_INFO

   Private Declare Function DeviceIoControl Lib "kernel32" (ByVal hDevice As Integer, ByVal dwIoControlCode As Integer, ByRef lpInBuffer As IntPtr,   ByVal nInBufferSize As Integer, ByRef lpOutBuffer As IntPtr, ByVal nOutBufferSize As Integer, ByRef lpBytesReturned As Integer, ByVal lpOverlapped As IntPtr) As Integer

   Private Declare Ansi Function DeviceIoControl Lib "kernel32" (ByVal hDevice As Integer, ByVal dwIoControlCode As Integer, ByVal lpInBuffer As Integer, ByVal nInBufferSize As Integer, ByRef lpOutBuffer As Integer, ByVal nOutBufferSize As Integer, ByRef lpBytesReturned As Integer, ByVal lpOverlapped As Integer) As Integer

   Private Declare Function DeviceIoControl Lib "kernel32" (ByVal hDevice As Integer, ByVal dwIoControlCode As Integer, ByRef lpInBuffer As IntPtr, ByVal nInBufferSize As Integer, ByRef lpOutBuffer As DISK_GEOMETRY, ByVal nOutBufferSize As Integer, ByRef lpBytesReturned As Integer, ByVal lpOverlapped As IntPtr) As Integer

   Private Declare Function DeviceIoControl Lib "kernel32" (ByVal hDevice As Integer, ByVal dwIoControlCode As Integer, ByRef lpInBuffer As IntPtr, ByVal nInBufferSize As Integer, ByRef lpOutBuffer As GETVERSIONOUTPARAMS, ByVal nOutBufferSize As Integer, ByRef lpBytesReturned As Integer, ByVal lpOverlapped As IntPtr) As Integer

   'Pentru DFP_RECEIVE_DRIVE_DATA

   Private Declare Function DeviceIoControl Lib "kernel32" (ByVal hDevice As Integer, ByVal dwIoControlCode As Integer, ByRef lpInBuffer As SENDCMDINPARAMS, ByVal nInBufferSize As Integer, ByRef lpOutBuffer As IntPtr, ByVal nOutBufferSize As Integer, ByRef lpBytesReturned As Integer, ByVal lpOverlapped As IntPtr) As Integer

   Private Declare Ansi Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Integer, ByVal dwShareMode As Integer, ByVal lpSecurityAttributes As IntPtr, ByVal dwCreationDisposition As Integer, ByVal dwFlagsAndAttributes As Integer, ByVal hTemplateFile As IntPtr) As Integer

   Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Integer) As Integer
   Private Declare Ansi Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" (ByRef i As OSVERSIONINFO) As Boolean
   Private Declare Function GetLastError Lib "kernel32" Alias "GetLastError" () As Integer
   Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal Destination As IDSECTOR, ByVal Source As Byte, ByVal Length As Long)

   Structure GETVERSIONOUTPARAMS

       Dim bVersion As Byte       ' Binary driver version.
       Dim bRevision As Byte      ' Binary driver revision.
       Dim bReserved As Byte      ' Not used.
       Dim bIDEDeviceMap As Byte  ' Bit map of IDE devices.
       Dim fCapabilities As Integer  ' Bit mask of driver capabilities.
       <MarshalAs(UnmanagedType.ByValArray, SizeConst:=3)> _
       Dim dwReserved() As Integer

   End Structure

   Structure IDEREGS

       Dim bFeaturesReg As Byte     ' // Used for specifying SMART "commands".
       Dim bSectorCountReg As Byte  ' // IDE sector count register
       Dim bSectorNumberReg As Byte ' // IDE sector number register
       Dim bCylLowReg As Byte       ' // IDE low order cylinder value
       Dim bCylHighReg As Byte      ' // IDE high order cylinder value
       Dim bDriveHeadReg As Byte    ' // IDE drive/head register
       Dim bCommandReg As Byte      ' // Actual IDE command.
       Dim bReserved As Byte    ' // reserved for future use.  Must be zero.

   End Structure

   Structure IDSECTOR

       Dim wGenConfig As Short
       Dim wNumCyls As Short
       Dim wReserved As Short
       Dim wNumHeads As Short
       Dim wBytesPerTrack As Short
       Dim wBytesPerSector As Short
       Dim wSectorsPerTrack As Short
       <MarshalAs(UnmanagedType.ByValArray, SizeConst:=2)> _
       Dim wVendorUnique() As Short
       <MarshalAs(UnmanagedType.ByValArray, SizeConst:=19)> _
       Dim sSerialNumber() As Byte
       Dim wBufferType As Short
       Dim wBufferSize As Short
       Dim wECCSize As Short
       <MarshalAs(UnmanagedType.ByValArray, SizeConst:=7)> _
       Dim sFirmwareRev() As Byte
       <MarshalAs(UnmanagedType.ByValArray, SizeConst:=39)> _
       Dim sModelNumber() As Byte
       Dim wMoreVendorUnique As Short
       Dim wDoubleWordIO As Short
       Dim wCapabilities As Short
       Dim wReserved1 As Short
       Dim wPIOTiming As Short
       Dim wDMATiming As Short
       Dim wBS As Short
       Dim wNumCurrentCyls As Short
       Dim wNumCurrentHeads As Short
       Dim wNumCurrentSectorsPerTrack As Short
       Dim ulCurrentSectorCapacity As Long
       Dim wMultSectorStuff As Short
       Dim ulTotalAddressableSectors As Long
       Dim wSingleWordDMA As Short
       Dim wMultiWordDMA As Short
       <MarshalAs(UnmanagedType.ByValArray, SizeConst:=127)> _
       Dim bReserved() As Byte

   End Structure

   Structure SENDCMDINPARAMS

       Dim cBufferSize As Integer      ' Buffer size in bytes
       Dim irDriveRegs As IDEREGS      ' Structure with drive register values.
       Dim bDriveNumber As Byte    ' Physical drive number to send command to (0,1,2,3).
       <MarshalAs(UnmanagedType.ByValArray, SizeConst:=3)> _
       Dim bReserved() As Byte    ' Bytes reserved
       <MarshalAs(UnmanagedType.ByValArray, SizeConst:=4)> _
       Dim dwReserved() As Integer       ' DWORDS reserved
       Dim bBuffer As Byte       ' Input buffer.

   End Structure

   Public Enum STATUS_FLAGS

       PRE_FAILURE_WARRANTY = &H1
       ON_LINE_COLLECTION = &H2
       PERFORMANCE_ATTRIBUTE = &H4
       ERROR_RATE_ATTRIBUTE = &H8
       EVENT_COUNT_ATTRIBUTE = &H10
       SELF_PRESERVING_ATTRIBUTE = &H20

   End Enum

   Structure ATTR_DATA

       Dim AttrID As Byte
       Dim AttrName As String
       Dim AttrValue As Byte
       Dim ThresholdValue As Byte
       Dim WorstValue As Byte
       Dim StatusFlags As STATUS_FLAGS

   End Structure

   Structure DRIVE_INFO

       Dim bDriveType As Byte
       Dim SerialNumber As String
       Dim Model As String
       Dim FirmWare As String
       Dim Cylinders As Long
       Dim Heads As Integer
       Dim SecPerTrack As Integer
       Dim BytesPerSector As Integer
       Dim BytesperTrack As Integer
       Dim NumAttributes As Byte
       Dim Attributes() As ATTR_DATA

   End Structure

   <StructLayout(LayoutKind.Sequential)> _
   Public Structure OSVERSIONINFO

       Public dwOSVersionInfoSize As Integer
       Public dwMajorVersion As Integer
       Public dwMinorVersion As Integer
       Public dwBuildNumber As Integer
       Public dwPlatformId As Integer
       <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=128)> _
       Public szCSDVersion As String

   End Structure

   Public Structure DISK_GEOMETRY

       Public Cylinders As Long
       Public MediaType As Integer
       Public TracksPerCylinder As Integer
       Public SectorsPerTrack As Integer
       Public BytesPerSector As Integer

   End Structure

   Private Sub test(ByVal VerParam As GETVERSIONOUTPARAMS, ByVal hdrive As Integer)

       di.bDriveType = 0
       di.NumAttributes = 0
       ReDim di.Attributes(0)
       If Not IsBitSet(VerParam.bIDEDeviceMap, 0) Then
       MsgBox("Not OK")
       Else
       MsgBox("OK")
       End If

   End Sub

   Private Function IsBitSet(ByVal iBitString As Byte, ByVal lBitNo As Integer) As Boolean
       If lBitNo = 7 Then
       IsBitSet = iBitString < 0
       Else
       IsBitSet = iBitString And (2 ^ lBitNo)
       End If
   End Function

   Private Function SwapStringBytes(ByVal sIn As String) As String

       Dim sTemp As String
       Dim i As Short
       sTemp = Space(Len(sIn))
       For i = 1 To Len(sIn) - 1 Step 2
       Mid(sTemp, i, 1) = Mid(sIn, i + 1, 1)
       Mid(sTemp, i + 1, 1) = Mid(sIn, i, 1)
       Next i
       SwapStringBytes = sTemp

   End Function

   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

       MsgBox(GetLastError())
       Dim hdrive As Integer
       Dim VersionParams As New GETVERSIONOUTPARAMS()

       'NOTE: .PHYSICALDRIVE0? Maybe better to use \\?\{HDD LETTER}\{PATH}
       'hDrive - Get a Handle to Drive/Path/File - If returns -1 then Access Denied or destination not found
       hdrive = CreateFile(".PHYSICALDRIVE0", GENERIC_READ Or GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero)

       'Issue a Command GET VERSION and test results
       Dim bytesReturned As Integer
       Dim result As Boolean
       MsgBox(GetLastError())
       result = DeviceIoControl(hdrive, DFP_GET_VERSION, IntPtr.Zero, 0, VersionParams, 24, bytesReturned, IntPtr.Zero)
       MsgBox(GetLastError())

       test(VersionParams, hdrive)
       MsgBox(GetLastError())

       'Issue a full IDE Command
       '
       Dim SCIP As SENDCMDINPARAMS
       Dim IDSEC As IDSECTOR
       Dim bArrOut(OUTPUT_DATA_SIZE - 1) As Byte
       Dim sMsg As String
       Dim lpcbBytesReturned As Integer
       Dim barrfound(100) As Integer
       Dim i As Integer
       For i = 0 To OUTPUT_DATA_SIZE - 1
       bArrOut(i) = 0
       Next
       Dim lng As Integer
       With SCIP
       .cBufferSize = IDENTIFY_BUFFER_SIZE
       .bDriveNumber = CByte(0)
       With .irDriveRegs
           .bFeaturesReg = 0
           .bSectorCountReg = 1
           .bSectorNumberReg = 1
           .bCylLowReg = 0
           .bCylHighReg = 0
           .bDriveHeadReg = &HA0S
           .bCommandReg = CByte(IDE_ID_FUNCTION)
       End With
       End With

       Dim arraySize As Integer = bArrOut.Length
       Dim buffer As IntPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(arraySize) * bArrOut.Length)
       If DeviceIoControl(hdrive, DFP_RECEIVE_DRIVE_DATA, SCIP, 32, buffer, OUTPUT_DATA_SIZE, lpcbBytesReturned, IntPtr.Zero) Then
       Marshal.Copy(buffer, bArrOut, 0, arraySize)
       End If

       CloseHandle(hdrive)
   End Sub

End Class

here's how to set a file to be a sparse file:

Sample Code:

   FileStream f=File.Open(filename,System.IO.FileMode.Open,System.IO.FileAccess.ReadWrite,System.IO.FileShare.None);
   int dwTemp=0;
   short shTemp=0;
   IntPtr fileHandle=f.SafeFileHandle.DangerousGetHandle();
   int result=DeviceIoControl(fileHandle,(int)EIOControlCode.FsctlSetSparse,ref shTemp,0,IntPtr.Zero,0,ref dwTemp,IntPtr.Zero);

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